万能的webView之Activity

对于使用webview加载一个网页，使用它的loadurl()方法即可，如果在程序内要打开网页，难么就要自己创建一个 WebViewClient,通过setWebViewClient进行关联，再如果网页里面有javaScript那就要设置了

//启用支持javascript
WebSettings settings = webView.getSettings();

settings.setJavaScriptEnabled(true);

这都是一系列问题，但有没有想过直接写一个activity，只需传入url就可以显示网页，包括解决缓存的使用：

webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);

后退时的操作：

//改写物理按键——返回的逻辑
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        if(keyCode==KeyEvent.KEYCODE_BACK)
        {

            if(webView.canGoBack())
            {
                webView.goBack();//返回上一页面
                return true;
            }
            else
            {
                System.exit(0);//退出程序
            }
        }
        return super.onKeyDown(keyCode, event);
    }

等等一些列问题.

在此就引入了一个相对比较万能的webview,传入url即可，复制就能使用的webview的activity

import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.widget.TextView;

public class WhyWebActivity extends CanbackWebActivity implements View.OnClickListener {

    private TextView header_title;
    private String webPageTitle;

    @Override
    protected int getContentView() {
        return R.layout.activity_new_web;
    }

    @Override
    protected WebView getWebview() {
        return (WebView) findViewById(R.id.new_web_view);
    }

    @Override
    protected NumberProgressBar getProgressbar() {
        return (NumberProgressBar) findViewById(R.id.new_web_progress_bar);
    }

    @Override
    protected TextView getTextViewClose() {
        return (TextView) findViewById(R.id.header_left_close);
    }

    @Override
    protected void setTitle(String urlTitle) {
        Intent intent = getIntent();
        if (intent != null) {
            webPageTitle = intent.getStringExtra("title");
        }
        if (webPageTitle != null && !webPageTitle.equals("")) {
            header_title.setText(webPageTitle);
        } else {
            header_title.setText(urlTitle);
        }
    }

    @Override
    protected void onLoadError(WebView webView, int errorCode, String description, String failingUrl) {

    }

    @Override
    protected void onLoadEnd(String url) {

    }

    @Override
    protected void initEnd() {
        webview.loadUrl(getIntent().getStringExtra("url"));                   // 网址
        findViewById(R.id.header_left_btn).setOnClickListener(this);          // 返回按钮点击事件
        header_title = (TextView) findViewById(R.id.header_title);
    }

    @Override
    protected void jsCallJava(MWebviewClient mWebviewClient) {

    }

    @Override
    protected void onJsRequest(Object data) {

    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            // 点击关闭页面
            case R.id.header_left_btn:
                onBackPressed();
                break;
        }
    }
}

然后就是父类CanBackWebActivity

package cn.moviebuff.app.homewall.Web;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.http.SslError;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.TextView;
import android.widget.Toast;
import com.umeng.socialize.ShareAction;
import com.umeng.socialize.UMShareListener;
import com.umeng.socialize.bean.SHARE_MEDIA;
import com.umeng.socialize.media.UMImage;
import org.json.JSONException;
import org.json.JSONObject;
import butterknife.ButterKnife;





public abstract class CanbackWebActivity extends Activity {

    protected WebView webview;
    protected NumberProgressBar progressbar;
    protected TextView textViewClose;
    protected MWebviewClient mWebviewClient;
    private String webTitle;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView();
        if (null != webview && null != progressbar && null != textViewClose) {
            iniWebview();
            initEnd();
        }
    }

    @Override
    public Intent getIntent() {
        return super.getIntent();
    }

    private void initView() {
        setContentView(getContentView());
        ButterKnife.inject(this);
        webview = getWebview();
        progressbar = getProgressbar();
        textViewClose = getTextViewClose();
        toastRoot = getLayoutInflater().inflate(R.layout.activity_sign, null);
    }

    protected abstract int getContentView();

    protected abstract WebView getWebview();

    protected abstract NumberProgressBar getProgressbar();

    protected abstract TextView getTextViewClose();

    protected abstract void setTitle(String urlTitle);

    protected abstract void onLoadError(WebView webView, int errorCode, String description, String failingUrl);

    protected abstract void onLoadEnd(String url);

    protected abstract void initEnd();

    protected abstract void jsCallJava(MWebviewClient mWebviewClient);

    protected abstract void onJsRequest(Object data);


    private static final String APP_CACAHE_DIRNAME = "/webcache";
    @SuppressLint("SetJavaScriptEnabled")
    @SuppressWarnings("deprecation")
    private void iniWebview() {

        webview.getSettings().setSupportZoom(false);
        webview.getSettings().setBuiltInZoomControls(false);
        try {
            webview.getSettings().setJavaScriptEnabled(true);
        } catch (Exception e) {
            System.out.println(e);
        }
        webview.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
        webview.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);  //设置 缓存模式
        // 开启 DOM storage API 功能
        webview.getSettings().setDomStorageEnabled(true);
        //开启 database storage API 功能
        webview.getSettings().setDatabaseEnabled(true);
        String cacheDirPath = getFilesDir().getAbsolutePath() + APP_CACAHE_DIRNAME;
        //设置  Application Caches 缓存目录
        webview.getSettings().setAppCachePath(cacheDirPath);
        //开启 Application Caches 功能
        webview.getSettings().setAppCacheEnabled(true);


        webview.setWebChromeClient(new MChormeClient());
        mWebviewClient = new MWebviewClient(webview);
        webview.setWebViewClient(mWebviewClient);
        progressbar.setProgressTextColor(Color.parseColor("#29b6f6"));

        textViewClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        // 添加js交互接口类，并起别名 webtest
        webview.addJavascriptInterface(this, "webtest");
        webview.setWebViewClient(new MWebviewClient(webview));

    }

    protected class MWebviewClient extends WVJBWebViewClient {

        public MWebviewClient(WebView webView) {
            //交互
            super(webView, new WVJBHandler() {
                @Override
                public void request(Object data, WVJBResponseCallback callback) {

                    JSONObject outdata = (JSONObject) data;
                    onJsRequest(outdata);
                    Intent intent = new Intent();
                    try {
                        String act = outdata.getString("act");
                        if (act != null) {
                            if (act.equals("showToast")) {
                                if (outdata.has("str")) {
                                    String str = outdata.get("str").toString();
                                    if (str != null) {
                                        showToast(str);
//                                        T.showShort(CanbackWebActivity.this,str);
                                    }
                                }
                            } else if 
                            }
                        }
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            });
            jsCallJava(this);
        }

        //加载开始
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }

        //加载完成
        @Override
        public void onPageFinished(WebView view, String url) {
            progressbar.setVisibility(View.GONE);
            onLoadEnd(url);
            super.onPageFinished(view, url);
            boolean isBack = webview.canGoBack();
            if (isBack) {
                textViewClose.setVisibility(View.VISIBLE);
            } else {
                textViewClose.setVisibility(View.GONE);
            }

            //被点击的图片地址为：http://image.moviebuff.cn/images/201609/mem_2016-09-19-10_1474253053_99140.jpg!600-max
            //动态注入js
            // 这段js函数的功能就是，遍历所有的img几点，并添加onclick函数，函数的功能是在图片点击的时候调用本地java接口并传递url过去
            view.loadUrl("javascript:(function(){" +
                    "var objs = document.getElementsByTagName(\"img\"); " +
                    "for(var i=0;i<objs.length;i++)  " +
                    "{"
                    + "    objs[i].οnclick=function()  " +
                    "    {  "
                    + "        webtest.jsInvokeJava(this.src);  " +
                    "    }  " +
                    "}" +
                    "})()");

        }

        //加载失败
        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            progressbar.setVisibility(View.GONE);
            onLoadError(webView, errorCode, description, failingUrl);

        }

        @Override
        public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
            super.onReceivedSslError(view, handler, error);
            progressbar.setVisibility(View.GONE);

        }
    }

    @JavascriptInterface
    public void jsInvokeJava(String img) {
        Log.i("ddddddddddsss", "被点击的图片地址为：" + img);
    }

    protected class MChormeClient extends WebChromeClient {

        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            if (newProgress == 100) {
                progressbar.setVisibility(View.GONE);
            } else {
                if (progressbar.getVisibility() != View.VISIBLE) {
                    progressbar.setVisibility(View.VISIBLE);
                }
                progressbar.setProgress(newProgress);
            }
            super.onProgressChanged(view, newProgress);
        }

        @Override
        public void onReceivedTitle(WebView view, String title) {
            super.onReceivedTitle(view, title);
            webTitle = title;
            setTitle(title);
        }
    }

    @Override
    public void onBackPressed() {
        if (null != webview && webview.canGoBack()) {
            webview.goBack();
        } else {
            webview.loadUrl("about:blank");
            super.onBackPressed();
        }
    }


    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
            webview.loadUrl("about:blank");
            //webView.destroy();
            onBackPressed();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    private void setShareContent(String share_text, String share_image, String share_url, String title) {

        final SHARE_MEDIA[] displaylist = new SHARE_MEDIA[]{
                SHARE_MEDIA.WEIXIN, SHARE_MEDIA.WEIXIN_CIRCLE,
                SHARE_MEDIA.QQ, SHARE_MEDIA.QZONE
        };
        UMImage localImage = new UMImage(thisActivity, R.drawable.ic_launcher);
        new ShareAction(this).setDisplayList(displaylist)
                .withText(share_text)         // 摘要
                .withTitle(title)             // 标题
                .withTargetUrl(share_url)     // 分享的网址
                .withMedia(localImage)        // 分享的图片
                .setListenerList(new UMShareListener() {
                    @Override
                    public void onResult(SHARE_MEDIA platform) {
                        T.showShort(thisActivity,"分享成功啦");
                    }

                    @Override
                    public void onError(SHARE_MEDIA platform, Throwable t) {
                        T.showShort(thisActivity,"分享失败啦");
                    }

                    @Override
                    public void onCancel(SHARE_MEDIA platform) {
                        T.showShort(thisActivity,"分享取消了");
                    }
                })
                .open();

    }

    private View toastRoot;
    private Toast toast = null;

    private void showToast(String msg) {
        TextView tv = (TextView) toastRoot.findViewById(R.id.TextViewInfo);
        if (toast == null) {
            toast = new Toast(CanbackWebActivity.this);
            tv.setText(msg);
        } else {
            tv.setText(msg);
        }
        toast.setView(toastRoot);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.show();
    }


}

剩下就是布局文件里的webview了，这个就不提供了，以上仅供参考，因为所在项目的不同，部分可能需要自行改改。

万能的webView之Activity

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